Lesser Black-backed Gull (graellsii & intermedius)
L. f. graellsii H.096 September & October 2009, Westkapelle, the Netherlands.
Ringed 3cy Larus fuscus from N Germany, overlap zone of graellsii "Dutch intergrade" and intermedius.
below: H.096 September 24 2009, Westkapelle, the Netherlands.
P7 fully grown. Wing-covert moult finished.
below: H.096 October 06 2009, Westkapelle, the Netherlands.
P1-P7 fully grown, P8 growing. Complete moult in last phase. Outer secondaries replaced for 3rd gen, central group missing and the last group is still 2nd gen (normally S16-S18, as is the case here). Tail completely white.